You can make it even easier by pretending old versions of your mobile OS don't count. Or at least it appears you're allowed to do this if you left all your prior mobile users high & dry after promising them upgrades, twice.
"Easier" doesn't mean easy - many players to the table, we are yet to see whether Tizen or Firefox OS manage to pull that easy feat.
What makes you think Mono plays (or is about to play) such a pivotal role?
Mono is significantly more important for the future of C# than Windows Phone.